QSK23 for Mining


QSK23 for MiningMining is a tough, demanding business - it needs to be supported by equipment with the power, durability, reliability, cost-effectiveness and performance that the job demands. You can count on the Cummins QSK23 to fit your most aggressive and specialized applications. Every time.

The QSK23 combines rugged productivity with a high power density and advanced engine management technology to deliver the lowest operating cost per ton of any mining engine in its class. Its high-pressure injection (HPI) fuel system (up to 29,000 psi/200,000 kPa) results in more complete combustion for superior engine response across the entire power curve and the lowest fuel consumption in its class. Its compact and balanced inline six-cylinder design and proven durability in the toughest mine sites make it a great choice to repower vee engines of similar displacement.

The one-piece Ferrous Cast Ductile (FCD) iron pistons and robust cylinder head work to improve long-term durability and dependability. A one-piece cast-iron block, forged-steel crankshaft and a large-diameter camshaft are some of the standard features that ensure long, reliable performance between overhauls, with the capability of multiple rebuild cycles.

With ratings from 760-950 hp (567-708 kW) in both emissions-certified and non-certified specifications, the QSK23 is the ideal choice for haul trucks, excavators and other heavy-duty mining equipment around the world. It has the proven technology you need to raise productivity and lower costs. Every ton.

Every QSK23 engine is covered by Cummins base warranty, one of the most comprehensive and simplest plans in the industry.

QSK23 customers also benefit from reduced maintenance and exceptional customer support.


Engine Type In-Line, 6-Cylinder
Aspiration  Turbocharged and Charge Air Cooled 
Displacement 1404 cu in 23 liters
Bore and Stroke 6.69 in x 6.69 in 170 mm x 170 mm
Oil System Capacity 54.8 U.S. qt 52 liters
Coolant Capacity* 48.8 U.S. qt 46.2 liters
Length 78.5 in 1994 mm
Width 42 in 1067 mm
Height 67.7 in 1720 mm
Weight (Dry) 5709 lb  2590 kg 
Weight (Wet) 6300 lb 2858 kg

Engine Finder Specifications

Certification Level Tier 2 / Stage II
Power 760 - 950 hp / 567 - 708 kW
Torque 2401 - 2897 lb-ft / 3255 - 3928 N•m


Tier 2 Certified Ratings
Engine Model Advertised hp (kW) @ rpm Peak Torque lb-ft (N•m) @ rpm
QSK23-950 950 (708) @ 2100 2897 (3928) @ 1400
QSK23-950 950 (708) @ 1800 2785 (3776) @ 1400
QSK23-860 860 (641) @ 2100 2785 (3776) @ 1400
QSK23-860 860 (641) @ 1800 2785(3776) @ 1400
QSK23-760 760 (567) @ 2100 2558 (3468) @ 1350
QSK23-760* 760 (567) @ 1800 2558 (3468) @ 1350
*Continuous rating
Non-Certified Ratings
Engine Model Advertised hp (kW) @ rpm Peak Torque lb-ft (N•m) @ rpm
QSK23-950 950 (708) @ 2100 2893 (3922) @ 1400
QSK23-900 900 (671) @ 2100 2700 (3661) @ 1400
QSK23-860 860 (641) @ 2100 2600 (3525) @ 1400
QSK23-800 800 (597) @ 2100 2440 (3308) @ 1400
QSK23-760 760 (567) @ 2100 2401 (3255) @ 1300

All ratings are intermittent unless otherwise noted. Additional ratings may be available. Check with your Cummins distributor or dealer.


  • One-Piece Cast-Iron Block - Heavy-duty design with wide cylinder spacing for long life and excellent rebuild capability.
  • Electronic Control System - Allows users to tailor fuel system calibrations to application requirements.  CENSE™ electronic monitoring reads engine operating conditions and automatically adjusts for peak operation.
  • Quantum System Electronics - High-speed Electronic Control Module (ECM) with a self-cooling mount is isolated from detrimental vibration loading. A field-proven, fully-sealed wiring harness with fail-safe connectors integrates the ECM with the engine sensors for optimized engine performance, monitoring and protection.  Quantum system technology is ideal for tough mining applications that demand continuous uptime carrying hundreds of tons capacity.
  • High-Pressure Injection (HPI) Fuel System - Provides a high-peak injection pressure for optimum combustion for low emissions and better fuel economy.  HPI fuel injection provides a “soft” injection start for lower combustion noise.  Other benefits include excellent cold-starting characteristics and improved transient response at all engine speeds.
  • Precision-Honed Cylinder Liners - Machined for durability.  Expansion and contraction will not create excess wear.
  • One-Piece Ferrous Cast Ductile Iron Pistons - Provide the strength and durability to handle high cylinder pressures for long life.
  • Twin Piston-Cooling Nozzles - Direct cooling streams of oil beneath each piston crown and bowl rim for long life in high-load applications with increased reliability.
  • Prelub™ System - Distributes oil to rifles and friction surfaces and builds oil pressure before cranking can occur.  A pressure switch assures proper oil pressure in the main rifle to reduce the risk of starting the engine without oil in the sump or filters.  Prelub is a standard option on all mining engines due to proven success in extending engine life-to-rebuild.
  • Large-Diameter Camshaft - 105 mm of hardened surfaces handle the loads associated with high-pressure fuel injection.
  • Seven-Bolt Cylinder Head - Delivers even clamping force, enabling high cylinder and injector pressures.
  • Two-Stage Cummins Oil Filter - Combination full-flow and bypass oil filter effectively removes harmful sludge and up to three times as many contaminants to reduce engine wear.
  • Premium Fan Drive – Incorporates large matched and sealed bearings, improved oil seals, and an improved idler system.  The fan drives have fixed fan centers with tensioning provided by a manually adjusted and maintenance free idler.  The fan drive is available with or without an electronically controlled oil-actuated fan clutch

Brochures Available

Title Bulletin Number Request View  
Cummins Tier 4 Final High-Horsepower Engines For The Mining Industry Brochure 4087264 Request View  Download
Encompass Tri-Fold Mailer 3624570 Request View  Download
High-Performance Engines For Mining Equipment Brochure 4087235 Request View  Download
QSK23 Engines For Mining Applications Spec Sheet 4087277 Request View  Download